Controller for mine locomotives



April 4, 1939. w. w. SLOANE CONTROLLER FOR MINE LOCOMOTIVES 2 Sheets-Sheet 1 Filed July 3, 1935 muEEma ar/4% O April 4, 1939. w. w. SLOANE CONTROLLER FOR MINE LOCOMOTIVES Filed July 3, 1935 2 Sheets-Sheet 2 z N! lrllll'lll m ziaw loss of braking power.

Patented Apr. 4, 1939 UNITED STATES iPATENT OFFICE CONTROLLER FOR MINE LOCOMOTIVES Application July 3, 1935, Serial No. 29,614

17 Claims.

This invention relates to improvements in locomotives and more particularly to improvements in a control system for mine locomotives of the dynamic braking type.

The principal objects of the invention are to provide a new and improved dynamic braking control system for mine locomotives, wherein the running points are operated through electrical contactors and dynamic braking is effected manually. Another object of my invention is to provide an electrical controller for locomotives of the class described so arranged as to render the electrical contactors inoperative during dynamic braking. Still another object of my invention is to provide a novel interlocking arrangement for the controller whereby said controller is locked from operation in dynamic braking when in a running position without first turning the com troller to an off position, and vice versa.

As heretofore constructed, mine locomotives have been provided with dynamic braking controlled by means of electrical contactors or by a completely manually operated controller. Either of such methods of control may be satisfactory under ordinary conditions, but where the loads are great and power requirements are high, a manually operated controller is inadequate to take care of breaking the circuit. Moreover, when braking of the locomotive is controlled dynamically by means of electrical contactors and where the track is rough or the grades are steep and the turns are relatively sharp, the trolley frequently jumps off the trolley wire which results in opening the contactors with a complete Such a condition is extremely dangerous and usually causes the locomotive to run away.

The device of my invention is so arranged as to obviate these difiiculties by combining the best control features for running and braking and providing a controller capable of controlling the locomotive by means of electrically operated contactors during running, and by manually operated contacts during the dynamic braking operation.

Other objects of my invention will appear from time to time as the following specification proceeds.

My invention may be more clearly understood by reference to the accompanying drawings in which:

Figure 1 is a wiring diagram illustrating one embodiment of my invention applied to a mining locomotive;

Figure 2 is a fragmentary side elevation of one form of controller embodying my invention with parts broken away and shown in vertical section in order to more clearly illustrate certain details thereof;

Figure 3 is a plan view of the controller shown in Figure 2 with parts broken away and shown in horizontal section;

Figure 4 is a partial fragmentary end view of the controller shown in Figure 2 with certain parts shown in vertical section;

Figure 5 is an enlarged view of the interlocking mechanism; and

Figure 6 is another enlarged view of the interlocking mechanism showing the parts in a different position than in Figure 5.

Referring now to the details shown in the drawings, the locomotive illustrated therein is of the two motor type and each of said motors is diagrammatically shown in Figure 1 as including 'an armature, indicated generally by reference character H, and a series field, indicated generally by reference character I2.

The locomotive circuit is controlled during running by suitable contactors operated through a controller, generally indicated by reference character l3 and shown in Figures 2 to 6, inclusive. Said controller is herein preferably shown as being of the series parallel contactor type and has manually operable contacts associated therewith and incorporated as a part thereof for controlling dynamic braking. Said controller includes a control drum A and a reverse drum B (which-in the present instance besides including means for reversing the motors, also includes means for switching them from a running to a braking position and vice versa).

The control drum A is provided with a series of contact segments, indicated by reference characters M- to 22, inclusive. Said contact segments are adapted to progressively engage a series of contact fingers M to 28 inclusive, upon rotation of said drum, which contact fingers are connected in a control circuit and serve to control operation of certain line contactors I to H1, inclusive, for cutting resistance from or into the motor circuit for starting and switching the motors from a series to parallel connection during running.

A series of main line contact segments, indicated by reference characters 23 to 2'1, inclusive, is also provided on the control drum A. Said contact segments are adapted to progressively engage a series of contact fingers 23 to 27 inelusive, connected directly in the main line circuit, for cutting resistance into or out of the locomotive circuit by manual operation of said control drum when the reverse drum B is positioned for dynamic braking.

As herein shown, the manually operated contacts 23 to 21, inclusive, are arranged to come into operation at the third running position of the controller as the low potential contact finger I'I" engages the contact segment I! during running of the locomotive. Thus, said manually operated main line contacts cut out resistance from the motors, one point later than said control contacts, when the reverse drum B is in a running position, which eliminates arcing between said main line contacts and fingers when said reverse drum is in a running position.

The reverse drum B is provided with a set of contact segments intersected by a broken line, indicated by reference characters ARB. Said contact segments are adapted to be engaged by certain contact fingers 23 to 36, inclusive. When said drum is so positioned that certain of said contact fingers engage the contact segments ARE, the motor associated with said fingers is connected in a reverse dynamic braking position. The circuit for reverse dynamic braking position is completed by means of a second set of contact fingers 31 to 44, inclusive, certain of which contact fingers are adapted to engage a set of contact segments intersected by a broken line, indicated by reference characters BBB. In a similar manner, the forward braking operation is controlled by a set of contact segments AFB on said reverse drum adapted to be engaged by certain of the fingers 28 to 36, inclusive, and a set of contact segments BFB adapted to be engaged by certain of the contact fingers 31 to 44, inclusive.

The reverse and forward running connections are controlled by contact segments ARR, BER and AFR, BFR, respectively, in a manner which will more clearly appear as this specification proceeds.

When the reverse drum B is in a forward running position so that certain of the contact fingers 28 to 36, inclusive, engage the contact segments AFR and certain of the contact fingers 31 to. 44, inclusive, engage the contact segments BFR, current is conducted to said reverse drum and the locomotive circuit by means of a trolley 45, and the contact fingers 38 which engage a contact segment 46 on said drum. From thence it passes to the contact fingers 31 and through a main line conductor 41 to the main line contactor I which, as shown in Figure 1, is open. Current is also conducted to the control circuit through a fuse 48 and conductor 49 to the contact finger 30 which engages a contact segment 50. From thence it passes to the contact finger 29 and through a conductor 5| to the contact finger I5 When the control drum A has been turned to the first running position, current will pass from said contact finger to the contact l5. From thence it will pass through the contact segment I4 and finger 14, through a control circuit conductor 52 to a coil 53 of the main line contactor l to energize said coil. This will close said main line contactor and open an auxiliary contact 54 associated therewith. Current will also pass through conductors 52 and 52 control circuit contacts 55 of contactor l and coil 55 of the main line contactor 9 for energizing said coil. This will close the contactor 9 and open control circuit contacts 51 of said contactor. The cont actors l and 9 being closed, current will flow through the main line conductor 47, main line contacts of contactor i, conductor 54*, a resistance 53, conductor 59, and a resistance 60. From said resistance current fiows through conductors Si and to a conductor Conductor 36 leads from a contact finger 36 on one side of the reverse drum to a contact finger 49 on the opposite side of the reverse drum and has a coil of an overload relay 3t connected in series therewith.

The reverse drum B, being in a forward running position, current fiows from the contact finger 49 through contact segment 39, contact finger 39 and armature H of one motor. From thence it fiows through contact finger 4|, contact segment 431 contact finger 42, field l2 of the same motor and through conductor 43 and main line contact segments of contactor 9. From thence it fiows through conductors 43 and 33 to a contact finger 33 on the opposite side of the reverse drum from contact finger 42. Contact finger conducts current through contact segment 33 contact finger 32 and armature II of the other motor. Current is conducted to the field oi the same motor through contact finger E l, contact segment E l contact segment 3| and contact finger 3i.

The two motors are thus connected in series for starting on the first running position with the resistances 58 and 60 in the motor circuit.

When the control drum A is turned to the second point, the contact segment IE will engage the contact finger ES This will conduct current through a conductor H and a coil 53 of the main line contactor 2 and energize said coil and close the main line contacts of said contactor and control circuit contacts 64 of said contactor. When the main line contactor 2 is closed, current flows through conductor 41, main line contacts of contactor 2, conductor 65 resistances 65 and 66, conductor 66 resistance 81, and conductor fil to conductor 6i. This places the resistances B5, 85 and 61 in parallel with the resistances 58 and 60 for the second running position.

In a like manner, rotation of the control drum to the third running position will engage the contact segment i? with the contact finger ll. Current flows from said contact finger through conductor li and coil 3 of contactor 3 to ground, to close said contactor. This will short the resistance 35 out of th circuit.

At this point it should be noted that the contact fingers 23, 23 and come into engagement with the contact segments 23, 24 and 25. This will complete a circuit from the conductor 4'! through a blowout coil M5 to the contact segments 23, it and 25 and the corresponding contact fingers 23, 24 and 2%. Current flows from the contact finger 2% through conductor 24 and through the resistance 58, conductor 59, resistance 69, conductor BI, and conductor Bi to the motor circuit. Current will also flow through the conductors 25 and resistances B5, 66 and 67, to the motor circuit. The contact fingers 2 3 and 25 thus put the resistances 5B, 60, and 135, SB and 6'5 into the motor circuit in parallel one step later than the contact fingers l4, l5 and lfi At the time the contact fingers M and 25 engage the contact segments 24 and 25, the contact segment H has come into engagement with the contact finger W and the resistance 65 has been shorted out of the circuit by the contactor 3. The contact fingers 2 1 and 25 accordingly perform no function in starting the locomotive.

nus when main line circuit is broken by turning the controller to an off position, there will Mia.

be no arcing of said manually operable main line contacts and fingers since the circuit has already been broken one step earlier by the before mentioned electrical contactors.

At the fourth running position} the contact finger I8 is engaged with the contact segment l8 and the circuit through a conductor l8 is closed-to energize a coil 4 of the contactor 4 and close the main line contacts of said contactor and open the control line contacts of said contactor. Current will thus flow from the conductor 41, through contactor l, resistance 58, conductor 59, and resistance 60 to the motor circuit. Current will also fiow from the conductor 41 through conductor 68 main line contact segments of the contactor 4 to the conductor 59, thus shorting the resistance 58 out of the motor circuit.

At the fifth running position, current flows from the contact segment 2| through the contact finger 20 and through a conductor 20 to energize a coil 5 of the contactor 5. It also passes through a conductor H6, auxiliary contacts II! of the contactor 8 and through a conductor H8 to and through coils T and 6 of the contactors l and 6 respectively for closing the main line contacts of said contactors.

Upon closing of the contactor 5, a circuit is closed from the main line conductor 41, through conductor I I9, main line contact segments of the contactor 5, to the conductor 66 thus shorting the resistance 66 from the motor circuit. Current will also flow through the resistance 58, conductor 59, resistance 60, conductor 6|, conductor 61, through the main. line contacts of the contactor l to the main line conduictor 41 and through a conductor I20 and main line contacts of the contactor 6, to the conductor 41 for shorting the resistance 60 from the motor circuit. At this point all resistances are shorted from the motor circuit and the motors are directly connected in series to the main line circuit.

At the sixth running position, the contact segments I9, l8, l5 and I4 engage the respective contact fingers Ill l8 l5 and l 4 and the contact fingers l6, I! and 2i! are disconnected from the respective contact segments on the control drum. This connects the contactors l, 3, 4, 8 and ID in the system and permits the contactors 5, 6, 1 and 9 to drop out of the system, putting the resistances 66 and 6! in the motor circuit in parallel with the resistance 60 in the hereinbefore described manner. The line contactors l, 3 and 4 are closed in the same manner as has previously been described, and the line contactors 8 and [0 are closed by engagement of the contact segment 59 with a contact finger 19*. This completes a circuit through conductors I9 it and le auxiliary contacts of the contactor 6, conductor l9, auxiliary contacts 7 of the contactor 1, conductors Hi and IE coil lfl of contactor III, to ground to close the main line contacts of said contactor. Closing of the main line contacts of the contactor Ill opens the auxiliary contacts 55 of said contactor which opens the circuit to the coil 56 of the contactor 9 and opens the main line contacts of said contactor and closes the auxiliary contacts of said contactor. Current will also flow from the conductor l 9 through control contact segments of contactor 9, through coil 8 of contactor 8, and through conductor l2l, contact segments of overload relay 36 to ground, closing the main line contacts of contactor 8.

When the contactors 8 and [0 are closed and the contactor 9 is open, the motors will be connected in parallel in the following manner:

One motor is connected in the circuit through conductor 6P conductor 36 contact finger 40, contact segment 39 contact finger 39 which conducts current to the armature of one motor. Current is conducted from said armature through contact finger 4!, contact segment 42 contact finger 42, field l2 of the same motor to ground through conductor 43 and main line contacts of contactor Ill.

The other motor is connected in the circuit through main line contact segments of contactor 8, conductor 33*, contact finger 33, contact segment 33 contact finger 32, armature H, contact finger at, contact segment se contact segment 3| and contact finger 3! through field I2 of the other motor to ground.

Still further rotation of the control drum A to the seventh and eighth running positions will cut all of the resistance from the motors in a manner which need not herein be described in detail since it is no part of my present invention.

When the reverse drum B is in either a forward or reverse braking position and certain of the fingers 28 to 36, inclusive, engage either the contact segments ARB or AFB and certain of the fingers 3'! to 43, inclusive, correspondingly enage either the contacts BRB or BFB, depending upon the direction in which the locomotive is running, the contact fingers 3B and 29 will be disconnected from the control circuit since there are no contact segments on said drum engaging said fingers when said drum is in either of said positions. This will disconnect the contact fingers M to 2% from the control circuit and open the main line contactors I to H1, inclusive.

Assuming the reverse drum B to be in a for- Ward braking position, the motors are connected to operate as generators by connecting the armai ture of one motor with the field of the other motor and by connecting the armatures of the two motors together. Tins is effected through the contact finger 3 leading from the armature of one motor and engaging a contact segment 12. Current passes through said contact segment and through a contact finger 33 to a contact finger as. The contact finger 35 engages a contact segment 72. From said contact segment current passes through a contact finger 36 and through U the conductor 36 and coil of overload relay 36 to a contact finger it! which engages a contact segment it on the opposite side of said reverse drum. From said contact segment current flows through a contact finger ti, armature ll of the r second motor, to a contact finger 32. The armatures of the two motors are thus connected together in series. From the contact finger 39, current passes through a contact segment 14 to a contact segment 75 which is engaged by a contact finger 3!. From said contact finger current passes through the field !2 of the first mentioned motor to ground. The other field B2 of the other motor is connected with the armature H of the first mentioned motor through contact segment 32 which is engaged with the contact finger 32. From said contact segment current fiows through the conductor it and contact segment 13, which is engaged with the contact finger 62. Current thus flows through said contact finger to the field E2 of the opposite motor and through contact finger 43, contact segment t l and contact finger 44 to ground. The fields of each of these motors are excited by a teaser coil 16 connected to the trolley 45 and connected to saidmotors by a con- 1 in the hereinbefore described manner.

ductor TI and the contact finger 40 which engages a contact segment 78 on said reverse drum.

When the reverse drum B is in a forward braking position, the circuit to the motors will be completed when the control drum A is turned to the third running point. At this time, the contact segments 23, 24 and 25 will engage the contact fingers 23, 24 and '25, and the resistances 58, B0, 65, 6G and 6'! will be cut in the motor circuit Further rotation of said control drum will engage the contact segment 26 with the contact finger 26 and short the resistance 65 from the circuit. On the last braking point, the contact segment 21 will engage the contact finger 21 and the resistances 58 and 65 will be shorted out of the circuit while the resistances 36, 66 and 6'! remain in the circuit.

It will, accordingly, be seen that the arrange ment is such. that a series of control circuit contacts is provided on the control drum which controls the operation of a series of electrically operated contactors and the making and breaking of the main line circuit during running of the locomotive, and that a series of manual contacts is also provided in the main line circuit which is connected in the circuit at all times and comes into operation after the circuit has been made or broken by the electrically operated contacts When the reverse drum is in a running position.

It may also be seen that when the reverse drum is in either a forward or reverse braking position, that the electrically operated contacts are completely disconnected from the main line circuit and the motors are controlled by means of the manually operated contacts and that a positive dynamic braking means has been provided which is effective when the power supply is cut off or the trolley is off the trolley wire. Referring now particularly to Figures 2 to 6, inclusive, which illustrate the means for interlocking the drums A and B and preventing the turning of the control drum A beyond a predetermined point when the reverse drum B is in a dynamic braking position, said control drum is mounted on a shai t 8|. Said shaft is journaled at its upper and lower ends in a casing 82 for the controller l3. In a like manner, the reverse drum B is mounted on a shaft 83 which shaft, in turn, is journaled in the controller casing 82. A handle 84 is mounted on the upper end of the shaft 8| for rotating said shaft and control drum in the usual manner. Likewise, a hand lever 85 is mounted on the upper end of the shaft $3 for rotating said reverse drum.

The control drum A is provided with an index or star wheel 36 which is keyed thereto. Said star wheel is provided with a number of depressions or receses which correspond to various operating positions of the control drum. The first of said recesses is indicated by reference character 81 and corresponds to the off position of the controller, and the last of said recesses is indicated by reference character 88 and corresponds to the extreme on position of the controller When the motors are in parallel and the resistances 58, 60, 65, 66 and 6'! are cut out of the locomotive circuit.

An index lever 90, journaled on a pin 9| depending from a cover 92 of the casing 82, has a pin 93 depending therefrom which is adapted to progressively engage the recesses 81 to 88 and serve as an index to determine when the control fingers come in contact with their respective contacts and also to serve as a means for locking the control drum from rotation. A compression spring 94 interposed between said index lever and a fixed lug 95 depending from said cover is provided to yieldably engage said pin with said recesses.

In a like manner, the reverse drum B is provided with an index or star wheel 96 having depressions or recesses 91, 98, 99, I and IOI formed therein, each of which recesses indicates a braking or running position on said reverse drum. The center recess 99 indicates a neutral position when all of the fingers 28 to 38, inclusive, and 31 to 44, inclusive, are disengaged from their respective contacts. The recesses 91 to NH, inclusive, are adapted to be engaged by a pin I02 depending from an index lever I03 pivoted to the cover 92 on a. pin 1514 depending therefrom. Said pin is yieldably engaged with said recesses by means of a compression spring H35 interposed between said index lever and the fixed lug 95.

A notched disk i6 is mounted on the shaft 83 above the star wheel 95 and as herein shown is formed integral with said star wheel. Said disk is provided with four notches, indicated by reference characters lBl', H983, I09 and H0, respectively, each of which notches correspond with the recesses 91, 538, i853 and IE1! in said star wheel and represent a running or braking position on said reverse drum. As herein shown, the two outer notches it? and H9 correspond to the two braking positions on said reverse drum, and the two inner notches m8 and H19 correspond to the two running positions on said reverse drum. It should herein be noted that the notches I88 and IE9 are of a greater depth than the notches I01 and Hi), the purpose of which arrangement will hereinafter more clearly appear as the specification proceeds.

A rocking member III is pivoted to a pin H2 interposed between the controller cover 92 and a bracket within the casing 82. Said rocking member is disposed between the drums A and B and has one arm extending therefrom, the end of which forms a latch or dog 2 !3 which is adapted to engage any one of the notches m1, 168, N19 or I ID to lock the reverse drum B from turning movement or look the control drum A from movement when engaging the outer periphery of said disk. Said rocking member is provided with another arm H4 which extends angularly away from the pin H2 in a direction opposite from the dog H3. Said arm is provided with a ballshaped end which is adapted to engage an arouate-shaped notch H formed in the end of the index lever 90.

Upon rotation of the control drum A, the index lever 90 will be moved in a direction away from the center of said drum as the pin 83 moves out of the respective notch with which it is in engagement and such movement of said index lever will tend to move the dog H3 towards the center of the reverse drum In the position shown in Figure 3, the pin :82 is in engagement with the center or neutral notch 99 of the reverse drum, and the dog H3, accordingly, is positioned to engage the outer periphery of the disk Hi5 between the notches Hi8 and Hill and lock the control drum A from movement.

When the reverse drum is in a running position, as shown in Figiue 5, the dog H3 is free to engage the notch Hi9 upon rotation of said control drum for locking said reverse drum from turning movement.

It should herein be noted that the depression or recess 81 in the star wheel 85 is of a greater depth than the other recesses in said star wheel This permits turning of said reverse drum when said control drum is in an oli position. Thus, when said reverse drum is in a running position, as shown in Figure 5, and the pin 93 is in engagement with any of the depressions 8? to 88, the dog I13 is moved into the respective notch a distance sufficient to lock said reverse drum from movement.

It should also be noted that the two depressions in the index 35 preceding the depression 88 are of a less depth than the first six depressions of said index. The purpose of this arrangement will readily be apparent in looking at Figure 6, wherein the drum B is shown in a braking position. Due to the fact that the notches I01 and H0 are of a less depth than the notches I68 and I09, when it is attempted to move the control drum beyond the fifth point, the dog 5 53 will engage the bottom of either of the notches I 07 or III], depending upon which braking posi tion said reverse drum is in, which will prevent movement of the index lever cc and further rotation of said control drum.

It will thus be apparent that a simplified and improved control means of a novel construction has been provided which is arranged to connect the motors in series for starting and in parallel for running and to control starting and running by means of contactors; and that this control means is also arranged to connect the motors to act as generators for dynamic braking when going down a grade, and to control the braking action by manual control means independently of the contactors and trolley and trolley wire. It will also be seen that this control system permits the heavy electrical loads on the motors while starting and running to be taken care of by means of electrical contactors, and that said contactors are entirely disconnected from the locomotive circuit during the braking operation. It will further be seen that this control means includes a controller having a novel arrangement of electrical switching means for disconnecting the contactors from the system during braking with a novel mechanical interlocking mechanism to prevent these contactors from being connected in the system except when the control drum is turned to an off position and the reverse drum is turn-ed to a running position.

While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction or arrangement of the various parts may be altered or changed without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting my self to the particular form shown, excepting as it may be limited in the appended claims.

I claim as my invention:

1. In a control system for electric locomotives, a controller including a control drum and a reverse drum, a motor, a series of electrical contactors operated by said control drum for making and breaking the main line circuit and cutting a resistance from or into said motor, means on said reverse drum for switching said motor to operate as a generator for dynamically braking the locomotive, said means also acting as a switching means for cutting said contactors from the locomotive circuit during the braking operations, and manually operable means on said control drum for making and breaking the main line circuit for controlling dynamic braking of said motor independently of said contactors.

2. In a control system for electric locomotives,

a controller including a control drum and a reverse drum, a motor, a series of electrical contactors operated by said control drum for making and breaking the main line circuit and cutting a resistance from or into said motor, means on said reverse drum for switching the motor to operate as a generator for dynamically braking the locomotive, said means also acting as a switching means for cutting said contactors from the locomotive circuit during the braking operation, and manually operable means for controlling dynamic braking of said motor comprising a set of contacts on said control drum for manually making or breaking the main line circuit independent of the contacts for operating said series of contactors.

3. In a control system for electric locomotives, a plurality of motors, electrically operated means under manual control for starting said motors comprising a controller including a control drum and reverse drum and a series of electrical contactors controlled by said control drum, means for connecting the field of one motor to the armature of the other motor so said motors may act as generators to dynamically brake the locomotive including switching means on said reverse drum, and means for manually making and breaking the main line circuit for controlling dynamic braking of said locomotive independently of said contactors including means associated with said reverse drum for disconnecting said contactors from the locomotive circuit during the braking operation and locking them in such a position.

4. In a control system for electric locomotives, a plurality of motors, electrically operated means under manual control for starting said motors comprising a controller including a control drum and reverse drum and series of electrical contactors controlled by said control drum, means for connecting the field of one motor to the armature of the other motor so said motors may act as generators to dynamically brake the locomotive including switching means on said reverse drum, and means for manually making and breaking the main line circuit for controlling dynamic braking of said locomotive independently of said contactors including means associated with said reverse drum for disconnecting said contactors from the locomotive circuit during the braking operation and locking them in such a position comprising mechanical means for interlocking said control drum with said reverse drum to prevent movement of one of said drums while the other is being operated.

5. In an electric locomotive, a plurality of motors, means for cutting out a resistance from said motors for starting and running including a series of electrically operated contactors and a controller for controlling operation of said contactors, said controller including a control drum and a reverse drum, a series of manual contacts on said control drum ior controlling operation of said contactors, another series of manual contacts on said control drum for manually cutting a resistance in or from said motors, and means on said reverse drum for connecting the field of one motor to the armature of the other motor so said motors may act as generators, to dynamically brake the locomotive, and disconnecting said contactors from the locomotive circuit, whereby said manual contacts may control operation of the locomotive.

6. In an electric locomotive, a plurality of motors, means for cutting out a resistance from said motors for starting and running including a series of electrically operated contactors and a controller for controlling operation of said contactors, said controller including a control drum and a reverse drum, a series of manual contacts on said control drum for controlling operation of said contactors, another series of manual contacts on said control drum for manually cutting a resistance in or from said motors, and means on said reverse drum for connecting the field of one motor to the armature of the other motor so said motors may act as generators, to dynamically brake the locomotive, and locking said contactors in disconnection from the locomotive circuit whereby said manual contacts may control the braking operation of the locomotive, including switching means on said reverse drum and mechanical interlocking means between said control and reverse drums.

7. In an electric locomotive, a pair of motors, means for controlling said motors comprising a controller including a control drum and a reverse drum and a series of electrical contactors operated by contacts on said control drum, means on said reverse drum for switching said motors to operate as generators for dynamically braking the locomotive, a set of manually operable contacts on said control drum independent of said electrical contactor controlling contacts, said manually operable contacts being directly connected with the locomotive circuit, and means associated with said switching means for cutting said electrical contactors from the locomotive cir cuit when in a dynamic braking position, whereby dynamic braking may be controlled by said manual contacts independently of said electrical contacts.

8. In an electric locomotive, a pair of motors, means for controlling said motors comprising a controller including a control drum and a reverse drum and a series of electrical contactors operated by contacts on said control drum, means on said reverse drum for switching said motors to operate as generators for dynamically braking the locomotive, a set of manually operable contacts on said control drum independent of said electrical contactor controlling contacts, said manually operable contacts being directly connected with the locomotive circuit, and means associated with said switching means for cutting said electrical contactors from the locomotive circuit when in a dynamic braking position and locking said contactors in disconnection from the locomotive circuit whereby said manual contacts may control the braking operation of the locomotive including mechanical interlocking means between said control and reverse drums.

9. In a controller for electric locomotives, a control drum, a reverse drum, a series of electrically operated contacts for controlling starting and running of a pair of traction motors, a series of contacts on said control drum for operating said electrically operated contacts, a series of contacts on said reverse drum for switching said traction motors to operate as generators to act as dynamic braking devices, another set of contacts on said control drum adapted to carry the full load of the motor circuit during braking and running, said contacts being manually operable, and means on said reverse drum for disconnecting said electrical contactors from the motor circuit during dynamic braking whereby the braking operation may be controlled by said manual contacts independently of the source of power supply.

10. In a controller for electric locomotives, a control drum, a reverse drum, a series of electrically operated contacts for controlling starting and running of a pair of traction motors, a series of contacts on said control drum for operating said electrically operated contacts, a series of contacts on said reverse drum for switching said traction motors to operate as generators to act as dynamic braking devices, another set of contacts on said control drum adapted to carry the full load of the motor circuit during braking and running, said contacts being manually operable, means on said reverse drum for disconnecting said electrical contactors from the motor circuit during dynamic braking, whereby the braking operation may be controlled by said manual contacts independently of the source of power supply, and means for interlocking said reverse and control drums when in a dynamic braking position comprising a star wheel on said control drum, an index lever yieldably engageable therewith, a notched disk on said reverse drum, each notch in said disk corresponding to a braking or mnning position on said reverse drum, a rocking lever pivoted between the axes of rotation of said drums, said rocking lever having one lever arm extending therefrom having operative engagement with said index lever and another lever arm extending therefrom having a latch engage able with a notch in said disk upon movement of said control drum.

11. In a controller for electric locomotives, a control drum, a reverse drum, a series of electrically operated contacts for controlling starting and running of a pair of traction motors, a series of contacts on said control drum for operating said electrically operated contacts, a series of contacts on said reverse drum for switching said traction motors to operate as generators to act as dynamic braking devices, another set of contacts on said control drum adapted to carry the full load of the motor circuit during braking and running, said contacts being manually operable and being arranged to come into operation later than said first-mentioned contacts so the circuit will be broken by said electrical contactors before it is broken by said manual contacts when said electrical contactors are connected in the electrical circuit, and means on said reverse drum for disconnecting said electrical contactors from the motor circuit during dynamic braking whereby the braking operation may be controlled by said manual contacts independently of the source of power supply.

12. In a controller, a control drum, a reverse drum, and means for interlocking said drums to prevent the operation of one while the other is in operation comprising an index wheel on said control drum, a notched disk on said reverse drum, each notch on said disk corresponding to an operating position on said reverse drum, an index lover yieldably engageable with said index wheel, a rocking member pivoted for movement about an axis parallel with the axis of rotation of said controller drum and disposed between the axes of rotation of said controller and reverse drums, said rocking member having one lever arm extending towards and having operative engagement with the free end of said index lever, and another lever arm having a free end forming a latch for engagement with the outer periphery of said disk to prevent rotation of said control drum while said reverse drum is being operated.

13. In a controller, a control drum having one set of contacts thereon adapted to control operation of a series of electrical contactors to make or break a main line circuit electrically and another set of contacts thereon adapted to make or break the main line circuit manually, a reverse drum adapted to connect a motor for running in either a forward or reverse direction and for dynamic braking in either a forward or reverse direction, and means on said reverse drum to prevent operation of said contactors when said drum is positioned for dynamic braking.

14. In a controller, a control drum having one set of contacts thereon adapted to control operation of a series of electrical contactors to make or break a main line circuit electrically and another set of contacts thereon adapted to make or break the main line circuit manually, a reverse drum adapted to connect a motor for running in either a forward or reverse direction and for dynamic braking in either a forward or reverse direction, means on said reverse drum to prevent operation of said contactors when said drum is positioned for dynamic braking, and means for interlocking said drums to prevent the operation of one while the other is in operation comprising an index wheel on said control drum having recesses therein corresponding with operating positions on said control drum, a disk on said reverse drum having a plurality of notches therein corresponding with operating positions on said reverse drum, an index lever yieldably engaging said index wheel, a rocking member pivoted for movement about an axis parallel with the axis of rotation of said control drum and disposed between the axes of rotation of said control and reverse drums, said rocking member having one lever arm extending towards and having operative engagement with the free end of said index lever, and another lever arm having a free end forming a latch for engagement with one of said notches or the outer periphery of said disk for interlocking said drums. 15. In a controller, a control drum having one set of contacts thereon adapted to control operation of a series of electrical contactors to make or break a main line circuit electrically and another set of contacts thereon adapted to make or break the main line circuit manually, a reverse 4 drum adapted to connect a motor for running in either a forward or reverse direction and for dynamic braking in either a forward or reverse direction, means on said reverse drum to prevent operation of said contactors when said drum is positioned for dynamic braking, and means for interlocking said drums to prevent the operation of one while the other is in operation comprising an index wheel on said control drum having recesses therein corresponding with operating positions on said control drum, a disk on said reverse drum having a plurality of notches therein corresponding with operating positions on said reverse drum, an index lever yieldably engaging said index wheel, a rocking member pivoted for movement about an axis parallel with the axis of rotation of said control drum and disposed between the axes of rotation of said control and reverse drums, said rocking member having one lever arm extending towards and having operative engagement with the free end of said index lever, and another lever arm having a free end forming a latch for engagement with one of said notches or the outer periphery of said disk for interlocking said drums, said notches in said reverse drums representing dynamic braking positions thereon being of less depth than said notches representing running positions, and the recesses in said index wheel representing dynamic braking points of contact on said manual contacts and the spaces between said recesses being spaced closer towards the center of said index wheel than the next succeeding recesses on said index wheel for locking said control drum from movement beyond a predetermined point when in a dynamic braking position.

16. In a motor control system, a controller including a control drum and a reverse drum, a motor, a series of electrical contactors controlled by said control drum for making or breaking a main line circuit and cutting resistance from or into. said motor, means on said reverse drum for switching said motor to operate as a generator for dynamically braking the locomotive, and manually operable means on said control drum for manually making or breaking the main line circuit and controlling dynamic braking of said motor independently of said contactors.

1'7. In a motor control system, a controller ineluding a control drum and a reverse drum, a motor, a series of electrical contactors controlled by said control drum for making or breaking a main line circuit and cutting resistance from or into said motor, a series of contacts on said control drum for controlling operation of said contactors, means on said reverse drum for switching said motor to operate as a generator for dynamically braking the locomotive, a series of manual contacts on said control drum adapted to make or break the main line circuit independently of said contactors, said manual contacts being so arranged with respect to said contacts for controlling said contactors as to cut resistance into or out of the motor circuit one step later than said contactors to prevent arcing between said manual contacts when said contactors are in the circuit, and said manual contacts being so arranged as to control dynamic braking of said motor independently of said contactors.

WILLIAM W. SLOANE. 

